I can capture packets using tcpdump OK as the source eth1 port is connected to a cisco switch span port, and filter using tcpdump options (at this stage interested in DNS packets to and from a particualar IP only). Rather than writing to a file, I want to simply dump the filtered raw (DNS) packets onto eth2 (which could be unnumbered or numbered). The reason for this is that a 3rd party needs access to the raw data, but I need to filter non-DNS traffic (otherwise I'd just let them connect to the switch span port). Preferably I also want to run the process continuously. Is there an easy way to direct the tcpdump output to an unnumbered eth interface, or is there a better way of achieving this?
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